# Commission Regulation (EU) No 748/2012 of 3 August 2012 laying down implementing rules for the airworthiness and environmental certification of aircraft and related products, parts and appliances, as well as for the certification of design and production organisations (recast) (Text with EEA relevance), Division (a): Each holder of an UKTSO authorisation under Subpart O shall permanently and legibly mark each article with the following information:

Extent: E+W+S+N.I.

1..the name and address of the manufacturer;
2..the name, type, part number or model designation of the article;
3..the serial number or the date of manufacture of the article or both; and
4..the applicable UKTSO number.

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Source: https://www.legislation.gov.uk/eur/2012/748/annex/I/section/A/division/subpart+q/division/21.a.807/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-748/annex-I/section-A/division-subpart+q/division-21.a.807/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.